[LEDE-DEV] wlan issue with TP-LINK wdr3600

[e9hack]

Hi,

I've trouble with this commit:

author		Hauke Mehrtens <hauke at hauke-m.de>	
		Tue, 22 Aug 2017 21:59:48 +0000 (23:59 +0200)
committer	Hauke Mehrtens <hauke at hauke-m.de>	
		Sun, 1 Oct 2017 10:49:11 +0000 (12:49 +0200)
commit		a8f63a0717f553e0a1b37ee9212fc4cb2a801426
mac80211: update to backports-4.14-rc2

Hostapd isn't able to initialize both wlan interfaces on my wdr3600 router. If I try to start hostapd manually, I get
the following output:

root at WLAN:~# /usr/sbin/hostapd -P /var/run/wifi-phy0.pid -dd /var/run/hostapd-phy0.conf
Configuration file: /var/run/hostapd-phy0.conf
wlan0: interface state UNINITIALIZED->COUNTRY_UPDATE
wlan0: interface state COUNTRY_UPDATE->HT_SCAN
20/40 MHz operation not permitted on channel pri=9 sec=5 based on overlapping BSSes
Using interface wlan0 with hwaddr 00:11:22:33:44:55 and ssid "WLAN"
Interface initialization failed
wlan0: interface state HT_SCAN->DISABLED
wlan0: AP-DISABLED
wlan0: interface state DISABLED->DISABLED
wlan0-4: AP-DISABLED
wlan0-4: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface wlan0-4 wasn't started
wlan0-3: AP-DISABLED
wlan0-3: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface wlan0-3 wasn't started
wlan0-2: AP-DISABLED
wlan0-2: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface wlan0-2 wasn't started
wlan0-1: AP-DISABLED
wlan0-1: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface wlan0-1 wasn't started
wlan0: AP-DISABLED
wlan0: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface wlan0 wasn't started
nl80211: deinit ifname=wlan0 disabled_11b_rates=0
ELOOP: remaining socket: sock=19 eloop_data=0x77473c70 user_data=0 handler=0x42fc94

The router uses the ath9k driver. I'm using my own hostapd build with internal radius support compiled in. I've a second
router TP-LINK Archer C7 with same core family but ath10k instead of ath9k. With this router, I don't have any problems.

Regards,
Hartmut